Keystones — Lintel
Five GCSE retrieval questions · 22 December 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
44000000
Answer: 4.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 32°. Find opposite
Answer: 18.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
Calculate the mean of: 24, 20, 42, 37, 20, 8, 35, 34
Answer: 27.5